An APD pixel block output voltage four-channel selection circuit and its output method

Abstract

The present invention discloses a 2*2 APD pixel block output voltage four-channel selection circuit. Each individual APD unit comprises an address selection control circuit and a four-channel selection circuit. The address selection control circuit detects a generated control signal through light and is connected to a four-channel selection circuit switch, wherein the control signal of each unit is connected to an own channel 1 and is respectively connected to the channel 2, the channel 3 and the channel 4 of other three APD units in 2*2 APD pixel blocks. In each time of illumination, only a pixel block head address output control signal is effective, and thus the sequential output of pixel block voltage from the four channels is ensured.

Description

technical field [0001] The invention belongs to the field of avalanche photodiode (Avalanche Photo Diode APD) array, and more specifically, relates to a 2×2 APD pixel block output voltage four-channel selection circuit. Background technique [0002] The APD array reading circuit is widely used in communication, imaging and distance measurement, etc., especially in the military field. The traditional APD array can only perform single-pixel photosensitive detection and output a single-point voltage. For multi-point photosensitive and There are very few studies on the multi-point voltage corresponding to the output of the voltage channel, and the multi-point photosensitive area receives a larger illumination area, which can actively and quickly adjust the position of the spot according to the illumination conditions of multiple APD units. At the same time, the size of the multi-point voltage can be adjusted. Fine-tuning, so as to carry out precise positioning, so the design of ...

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Problems solved by technology

[0003] In view of the fact that there is only a single-point voltage output in the prior art, which makes the determination of the illumination position inaccurate, this application provides a 2×2 APD pixel block output voltage four-channel selection circuit, in which the key components are For example, the specific structure and setting method of the selection control circuit and channel selection circuit are researched and designed, and the pixel block voltage is output sequentially, and it has the advantages of precise positioning, so it is especially suitable for the application of multi-point voltage output.

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